Material mixing of cone-in-shell targets for indirect-drive fast ignition
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摘要: 与中心点火相比，快点火将压缩和点火过程分开，大大放宽了对压缩对称性和驱动能量的要求。通过在神光Ⅱ激光装置上开展了快点火锥壳靶预压缩实验研究，利用X射线背光分幅照相方法观察到了清晰完整的快点火锥壳靶内爆压缩过程，并利用阿贝反演结合剩余烧蚀质量的方法得到了不同时刻燃料密度、面密度分布数据，当前实验条件下获得的最大压缩密度和面密度分别为30 g/cm3和50 mg/cm2；为解决金柱腔M带对导引锥的预热以及由此导致的燃料-锥体材料混合问题，提出了一种在锥体表面镀低Z材料的方法，实验和辐射流体数值模拟结果验证了该方法的有效性，该方法的成功解决了间接驱动快点火激光聚变的重要关键技术问题。Abstract: Compared with central ignition of laser fusion, fast ignition separates compression and ignition thus it can relax the requirements for the implosion symmetry and the driven energy. Indirect drive pre-compression of cone-in-shell target for fast ignition was performed on Shenguang Ⅱ laser facility. The temporal evolution of the target was observed by the X-ray backlight framed camera. The density and areal density of the compressed fuel which were obtained from the backlight figures are 30 g/cm3 and 50 mg/cm2 separately. To minimize the mixing of the compressed fuel and cone high-Z vapor produced by the M-line emission from the gold holhraum, a CH foil was coated on the full outer surface of the cone. Experimental results and simulation results demonstrated that the coated CH foil could minimize the mixing effectively.
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Key words:
- fast ignition /
- indirect drive /
- laser fusion /
- cone-in-shell target /
- material mixing
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